There are several fake REST APIs that you can use to build prototypes:
JSON Placeholder - A simple and robust REST API that provides fake data for testing and prototyping.
https://jsonplaceholder.typicode.com/fetch('https://jsonplaceholder.typicode.com/todos/1') .then(response => response.json()) .then(json => console.log(json))FakeRest - An API that allows you to generate fake REST APIs with custom routes, responses, and headers.
This is a Free and Online Fake REST API. You could use this API on your next blog post, If you need to test your REST client application which you’ve developed with any programming language or you have to check how modern REST API’s are working, how we should create Endpoints or anything that you need to do with REST API could accomplish using the following API which is already hosted and accessible via the internet for FREE
https://www.instantwebtools.net/fake-rest-api
3.WireMock - A flexible library for stubbing and mocking REST APIs. It enables you to simulate the behavior of a REST API and provides a platform-agnostic and language-agnostic way of testing REST APIs.
4.Nock - An HTTP server library for Node.js that enables you to stub and mock HTTP requests.
click the link to integrate nock api
https://pub.dev/documentation/nock/latest/
5.Postman - A comprehensive platform for API development that provides a powerful set of tools for testing and mocking REST APIs.
The Postman platform includes a comprehensive set of tools that help accelerate the API lifecycle—from design, testing, documentation, and mocking to the sharing and discoverability of your APIs.
6.RapidAPI - A platform that provides access to a vast library of APIs, including mock APIs for testing and prototyping.
7.StopLight - A platform for API design and development that provides a visual interface for creating and testing mock APIs.
8.ApiMock.io - A free service that enables you to create and manage mock APIs in the cloud.
Parallelize frontend and backend development by providing a mock api both teams align on without wasting time waiting for each other!
These are some of the popular fake REST APIs that you can use to build prototypes. You can choose the one that best fits your needs and requirements.